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// This code is derived from jcifs smb client library <jcifs at samba dot org>
// Ported by J. Arturo <webmaster at komodosoft dot net>
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
using System.IO;
using SharpCifs.Util.Sharpen;
namespace SharpCifs.Netbios
{
public abstract class SessionServicePacket
{
internal const int SessionMessage = unchecked(0x00);
internal const int SessionRequest = unchecked(0x81);
public const int PositiveSessionResponse = unchecked(0x82);
public const int NegativeSessionResponse = unchecked(0x83);
internal const int SessionRetargetResponse = unchecked(0x84);
internal const int SessionKeepAlive = unchecked(0x85);
internal const int MaxMessageSize = unchecked(0x0001FFFF);
internal const int HeaderLength = 4;
// session service packet types
internal static void WriteInt2(int val, byte[] dst, int dstIndex)
{
dst[dstIndex++] = unchecked((byte)((val >> 8) & unchecked(0xFF)));
dst[dstIndex] = unchecked((byte)(val & unchecked(0xFF)));
}
internal static void WriteInt4(int val, byte[] dst, int dstIndex)
{
dst[dstIndex++] = unchecked((byte)((val >> 24) & unchecked(0xFF)));
dst[dstIndex++] = unchecked((byte)((val >> 16) & unchecked(0xFF)));
dst[dstIndex++] = unchecked((byte)((val >> 8) & unchecked(0xFF)));
dst[dstIndex] = unchecked((byte)(val & unchecked(0xFF)));
}
internal static int ReadInt2(byte[] src, int srcIndex)
{
return ((src[srcIndex] & unchecked(0xFF)) << 8) + (src[srcIndex + 1] & unchecked(
0xFF));
}
internal static int ReadInt4(byte[] src, int srcIndex)
{
return ((src[srcIndex] & unchecked(0xFF)) << 24) + ((src[srcIndex + 1] & unchecked(
0xFF)) << 16) + ((src[srcIndex + 2] & unchecked(0xFF)) << 8) + (src
[srcIndex + 3] & unchecked(0xFF));
}
internal static int ReadLength(byte[] src, int srcIndex)
{
srcIndex++;
return ((src[srcIndex++] & unchecked(0x01)) << 16) + ((src[srcIndex++] & unchecked(
0xFF)) << 8) + (src[srcIndex++] & unchecked(0xFF));
}
/// <exception cref="System.IO.IOException"></exception>
internal static int Readn(InputStream @in, byte[] b, int off, int len)
{
int i = 0;
int n;
while (i < len)
{
n = @in.Read(b, off + i, len - i);
if (n <= 0)
{
break;
}
i += n;
}
return i;
}
/// <exception cref="System.IO.IOException"></exception>
internal static int ReadPacketType(InputStream @in, byte[] buffer, int bufferIndex
)
{
int n;
if ((n = Readn(@in, buffer, bufferIndex, HeaderLength)) != HeaderLength)
{
if (n == -1)
{
return -1;
}
throw new IOException("unexpected EOF reading netbios session header");
}
int t = buffer[bufferIndex] & unchecked(0xFF);
return t;
}
internal int Type;
internal int Length;
public virtual int WriteWireFormat(byte[] dst, int dstIndex)
{
Length = WriteTrailerWireFormat(dst, dstIndex + HeaderLength);
WriteHeaderWireFormat(dst, dstIndex);
return HeaderLength + Length;
}
/// <exception cref="System.IO.IOException"></exception>
internal virtual int ReadWireFormat(InputStream @in, byte[] buffer, int bufferIndex
)
{
ReadHeaderWireFormat(@in, buffer, bufferIndex);
return HeaderLength + ReadTrailerWireFormat(@in, buffer, bufferIndex);
}
internal virtual int WriteHeaderWireFormat(byte[] dst, int dstIndex)
{
dst[dstIndex++] = unchecked((byte)Type);
if (Length > unchecked(0x0000FFFF))
{
dst[dstIndex] = unchecked(unchecked(0x01));
}
dstIndex++;
WriteInt2(Length, dst, dstIndex);
return HeaderLength;
}
/// <exception cref="System.IO.IOException"></exception>
internal virtual int ReadHeaderWireFormat(InputStream @in, byte[] buffer, int bufferIndex
)
{
Type = buffer[bufferIndex++] & unchecked(0xFF);
Length = ((buffer[bufferIndex] & unchecked(0x01)) << 16) + ReadInt2(buffer
, bufferIndex + 1);
return HeaderLength;
}
internal abstract int WriteTrailerWireFormat(byte[] dst, int dstIndex);
/// <exception cref="System.IO.IOException"></exception>
internal abstract int ReadTrailerWireFormat(InputStream @in, byte[] buffer, int bufferIndex
);
}
}
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